Team up with Yoshi to solve the riddles of each of 10 levels as you make your way to the boss who is of course Bowser. Unless you were expecting someone different? Each level will tell you what to do to complete it such as rescuing Princess Peach or finding all the mushrooms. Be sure to make use of the fact that you can switch control between Mario and Yoshi. They don't have to be in the same part of the level!